donuts can't parse zones containing SSHFP records (RFC 4255).
donuts NSEC TTL rule has intermittent trouble with RIPE DISI dnssigner signed zones, as dnssigner sometimes moves the SOA away from the start of the zone file.
This was actually a problem with a perl module (Net::DNS::ZoneFile::Fast) that has been fixed in the more recent version of it (which is in our SVN repository and on CPAN and in the latest DNSSEC-Tools release).
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